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65 lines
2 KiB
C++
65 lines
2 KiB
C++
/*
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* SRT - Secure, Reliable, Transport
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* Copyright (c) 2018 Haivision Systems Inc.
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*
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*/
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/*****************************************************************************
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written by
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Haivision Systems Inc.
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*****************************************************************************/
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#include "win/wintime.h"
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#include <sys/timeb.h>
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void SRTCompat_timeradd(struct timeval *a, struct timeval *b, struct timeval *result)
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{
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result->tv_sec = a->tv_sec + b->tv_sec;
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result->tv_usec = a->tv_usec + b->tv_usec;
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if (result->tv_usec >= 1000000)
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{
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result->tv_sec++;
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result->tv_usec -= 1000000;
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}
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}
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int SRTCompat_gettimeofday(struct timeval* tp, struct timezone* tz)
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{
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static LARGE_INTEGER tickFrequency, epochOffset;
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// For our first call, use "ftime()", so that we get a time with a proper epoch.
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// For subsequent calls, use "QueryPerformanceCount()", because it's more fine-grain.
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static int isFirstCall = 1;
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LARGE_INTEGER tickNow;
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QueryPerformanceCounter(&tickNow);
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if (isFirstCall)
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{
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struct timeb tb;
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ftime(&tb);
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tp->tv_sec = (long)tb.time;
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tp->tv_usec = 1000*tb.millitm;
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// Also get our counter frequency:
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QueryPerformanceFrequency(&tickFrequency);
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// And compute an offset to add to subsequent counter times, so we get a proper epoch:
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epochOffset.QuadPart = tb.time*tickFrequency.QuadPart + (tb.millitm*tickFrequency.QuadPart)/1000 - tickNow.QuadPart;
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isFirstCall = 0; // for next time
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}
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else
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{
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// Adjust our counter time so that we get a proper epoch:
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tickNow.QuadPart += epochOffset.QuadPart;
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tp->tv_sec = (long) (tickNow.QuadPart / tickFrequency.QuadPart);
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tp->tv_usec = (long) (((tickNow.QuadPart % tickFrequency.QuadPart) * 1000000L) / tickFrequency.QuadPart);
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}
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return 0;
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}
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